"""
4 demo classes run as independent program processes: command lines;
if one window is quit now, the others will live on; there is no simple way to
run all report calls here (though sockets and pipes could be used for IPC), and
some launch schemes may drop child program stdout and disconnect parent/child;
"""
from tkinter import Tk, Label
from PP4E.launchmodes import PortableLauncher
demoModules = ['demoDlg', 'demoRadio', 'demoCheck', 'demoScale']
for demo in demoModules: # see Parallel System Tools
PortableLauncher(demo, demo + '.py')() # start as top-level programs
root = Tk()
root.title('Processes')
Label(root, text='Multiple program demo: command lines', bg='white').pack()
root.mainloop()
# GUI server side: read and display non-GUI script's output
import sys, os
from socket import * # including socket.error
from Tkinter import Tk
from PP4E.launchmodes import PortableLauncher
from PP4E.Gui.Tools.guiStreams import GuiOutput
myport = 50008
sockobj = socket(AF_INET, SOCK_STREAM) # GUI is server, script is client
sockobj.bind(('', myport)) # config server before client
sockobj.listen(5)
print('starting')
PortableLauncher('nongui', 'socket-nongui.py -gui')() # spawn non-GUI script
print('accepting')
conn, addr = sockobj.accept() # wait for client to connect
conn.setblocking(False) # use nonblocking socket (False=0)
print('accepted')
def checkdata():
try:
message = conn.recv(1024) # don't block for input
#output.write(message + '\n') # could do sys.stdout=output too
print(message, file=output) # if ready, show text in GUI window
except error: # raises socket.error if not ready
print('no data') # print to sys.stdout
root.after(1000, checkdata) # check once per second
# e.g. 10-25
import sys, os
from socket import *
from tkinter import Tk
from PP4E.launchmodes import PortableLauncher
from PP4E.GUI.Tools.guiStreams import GuiOutput
myport = 50008
sockobj = socket(AF_INET, SOCK_STREAM)
sockobj.bind(('', myport))
sockobj.listen(5)
print('starting...')
PortableLauncher('nongui', 'socket-nongui.py -gui')()
print('accepting...')
conn, addr = sockobj.accept()
conn.setblocking(False)
print('accepted!')
def checkdata():
try:
message = conn.recv(1024)
#output.write(message + '\n')
print(message, file=output)
except error:
print('no data')
root.after(1000, checkdata)
def spawn(self, pycmdline, wait=FALSE):
if not wait:
PortableLauncher(pycmdline, pycmdline)()
else:
System(pycmdline, pycmdline)()
def spawn(self, pycmdline, wait=False):
if not wait: # start new process
PortableLauncher(pycmdline, pycmdline)() # run Python progam
else:
System(pycmdline, pycmdline)() # wait for it to exit